Brush



G. KARL Jan. 31, 1967 BRUSH Filed Sept. 30, 1964 10 var/far. GEOPG KAFLATTOPNEK United States Patent 3,300,808 BRUSH Georg Karl,Waizendorf-Bechhofen,

Middle Franconia, Germany Filed Sept. 30, 1964, Ser. No. 400,399 Claimspriority, application Germany, Nov. 30, 1963, K 46.428 1 Claim. (Cl.15-604) This invention concernsbrushes of the type comprising bristlesprovided upon a handle having a passage or channel therethrough whichleads to the bristles and whereby fluid or paste can be supplied to suchbristles.

It has already been proposed to construct a brush, for the applicationof nail lacquer, with a holder constituting a container for the lacquer,in a channel in the handle of the brush serving to feed the lacquer tothe bristles. In such brush, the bristles are fastened by their rootsbeing clamped between two concentric light metal rings, the inner ringhaving a central opening which, when the bristles are secured to thehandle, provides a continuation of the passage or channel in the handle.The handle is formed of a resilient material and is provided with acavity into which the unit, composed of the rings with the bristlesprojecting therefrom, is pressed.

The gripping of the bristles between two rings is not simple, and it isnot always possible to ensure that all the bristles are properlyclamped. The brush is comparatively expensive to produce, and thefitting of the bristle and ring assembly into the cavity of the handleis difiicult and time consuming.

An object of this invention is to provide a construction wherein thebristles are secured to the handle in a very simple and convenientmanner which simplifies the operation of fastening the bristles to thehandle.

With this object in view, the present invention provides a brushcomprising a handle, a tapering extension on one end of said handle, achannel extending through said handle and said extension, a cup-shapedend cap fitting onto said end of said handle, a hole in said end cap incorrespondence with said extension so that said extension projects intosaid hole, and a bundle of bristles secured to said handle by the rootends thereof being accommodated in said hole and being gripped betweenthe wall of said hole and said extension.

With the construction according to the invention, all that is requiredfor fixing the bristles to the handle is for a bundle of the bristles tobe inserted into the hole in the base of the end cap and for the end capto be pressed onto the end of the handle. This serves to cause the rootsof the bristles to be spread out and gripped tightly against the walldefining the hole in the end cap, whereby the bristles are held firmlyin position. It will be appreciated that the assembly of the parts isvery simple.

The material of the handle and the end cap is preferably polyethylene,since this material is resilient and comparatively flexible.Accordingly, there will be no tearing or splitting of the end cap uponinsertion of the handle, and secure gripping of the end cap on to thehandle and secure fastening of the bristles to the handle is assured.

In order to assure that, during the assembly of the endcap on to thehandle, the extension on the handle enters into and spreads out theroots of the bristles, a spigot is preferably provided, this having apointed end and being adapted for insertion into the passage or channelof the handle with the pointed end protruding so as to constitute acontinuation of the aforesaid extension. During the insertion of thehandle into the end cap, therefore, the pointed end of the spigot willfirst encounter the roots of the bristles and effect an initialspreading-out thereof,

Patented Jan. 31, 1967 prior to penetration of the extension into thebristles. When the handle has been pressed fully home into the end cap,the spigot is, of course, removed.

The invention will be described further, by way of example, withreference to the accompanying drawings, in which:

FIG. 1 is a part-sectional side elevation of preferred embodiment of thebrush of the invention; and

FIG. 2 is a view similar to FIG. 1, but showing how the bristles aresecured to the handle.

As shown, the brush comprises a handle 8, on one end of which isprovided a cup-like end cap 1 having a thickened base 3 and defining anaxial cavity 2 for receiving the handle, an axial hole 4 of diametersmaller than that of the cavity 2 being provided in the base 3. The hole4 serves to accommodate a bundle of hairs or fibres 5, the root ends 6of which extend into the cavity 2. FIG. 2 shows the parts of the brushduring assembly thereof, and it will be seen that the hairs or fibres 5are arranged in the hole 4 so as to project into the cavity 2 by adistance L which approximates to the radial width of the annular surface15 of the bottom of the cavity 2 surrounding the axial hole 4; however,the fibres or hairs 5 can be inserted so as to project by a greater orlesser distance into the cavity 2, although as will later becomeapparent, the roots 6 must project at least a short way into the cavity2. The end cap 1 is preferably made of polyethylene, but it can, ofcourse, be made of other suitable materials.

The handle 8 is of circular cross-section and has an outside diametersuch that it is a tight push fit into the end cap 1, so that no adhesiveis necessary to secure the end cap 1 fast onto the handle 8, althoughadhesive can, if desired, be employed.

That end of the handle 8 which is intended to be secured into the endcap 1 has an axial frusto-conical extension 10 of small diameter,surrounded by an annular end face of the handle. The greatest diameterof the cone 10 is smaller than the internal diameter of the hole 4 inthe base 3 of the end cap 1, and when the handle 8 is inserted into thecavity 2, as shown in FIG. 2, the extension 10 is aligned with the hole4. The handle 8 has an axial bore or channel 11 which extends throughthe extension 10. To assemble the bristles (i.e. the hairs or fibres 5)onto the handle 8, firstly such bristles are inserted into the hole 4 ofthe end cap 1, as already described and as shown in FIG. 2, to projectby their roots 6 into the cavity 2. The number of fibres or hairsemployed is such as to form a bundle which can just be inserted into thehole 4 and care is taken to ensure that they project into the cavity 2.

Next, a metal spigot 13 is inserted into the channel 11 of the handle 8,this spigot 13 having a pointed end 14 which, when the spigot 13 isproperly inserted, just projects from the extension 10 and constitutesan efiiective continuation thereof. The spigot 13 is an easy sliding fitin the channel 11 so that it can readily be withdrawn therefrom.

Thereupon, the handle 8 is forced into the end cap 1, as indicated inFIG. 2. When the point 14 of the spigot 13 reaches the roots 6 of thefibres or hairs 5, it separates the latter and spreads them out, and asthe handle 8 moves further into the cap 1, the extension 10 penetratesinto the roots 6 and spreads them further. Eventually, the outspreadroots 6 are engaged by the annular end face 9 of the handle whichpresses them towards the annular surface 15 of the bottom of the cavity2, while the extension 10 enters into the hole 4 and forces outwardsthose parts 12 of the bristles which are within the hole 4. Finally, thehandle 8 is eventually forced fully into the cap 1, as shown in FIG. 1,wherein the roots 6 are gripped between the confronting annular surfaces9 and 15 and 3 the parts 12 of the bristles are gripped tightly betweenthe extension 10 of the handle 8 and the wall of the hole 4. The spigot13 is then removed and the handle 8 can then be connected, at its endremote from the end cap 1, to an appropriate container (not shown) forfeeding liquid or pastry materials to the bristles 5.

Polyethylene is a suitable material for the parts of the brush, but, thehandle and cap can, if desired, be of any other suitable material, suchas metal.

I claim: 1 A brush comprising, a handle having an end face, a taperingextension projecting centrally from and integral with the end face ofsaid handle, a channel extending through said handle and extension, 9.cup-shaped end cap sleeved upon said handle for enclosing the end faceof said handle, said end cap having an inner bottom wall coplanar withthe end face of said handle and having an opening therethrough inalignment with said extension for the extending of said extensionthereinto, a bundle of bristles having root ends and being securedrelative to said handle by the accommodation of the root ends throughthebp'ening of said end cap and the gripping thereof between the wall ofthe opening of said end cap and extension with said extension extendinginto the bristles of said bundle 5 thereof and with the innermost endsof the bristles of said bundle thereof being forced into confronta tionwith the inner bottom wall of said end cap by the end face of saidhandle, and a removable spigot having a pointed end andhaving a slidingfit in said channel for spreading the root ends of the said bristles'ofsaid bundle thereof.

References Cited by the Examiner UNITED STATES PATENTS 15 4/1880 Davids1s-- 154 x FOREIGN PATENTS 9/ 1920 Switzerland. 8 l 95 8 Austria.

